MassIVE MSV000082435

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Integrated strategy for high-sensitive phosphoproteome analysis from low micrograms of protein samples

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Description

In this study, we aimed to challenge the lowest starting material limit for phosphoproteome profiling. By carefully optimizing the well-established high-pH reversed-phase (RP) fractionation plus Ti4+-IMAC enrichment strategy, we achieved the identification of 15260 and 8936 unique phosphopeptides from only 500 ug and 250 ug predigested peptides, respectively. To further improve the sensitivity of phosphoproteome analysis for low micrograms of protein samples, we developed an integrated strategy, termed Phospho-SISPROT. This technology integrates three tips in tandem for protein digestion by the simple and integrated spintip-based proteomics technology (SISPROT), phosphopeptide enrichment by Ti4+-IMAC tip, and desalting by StageTip, respectively, which could dramatically reduce the phosphoproteome analysis time from a couple of days to only 6 hours and improve the system sensitivity. The flow through of Phospho-SISPROT could be reused for the global protein identification, which is very helpful for accurate phosphoproteome analysis with limited starting materials. More than 5500 and 600 unique phosphopeptides were respectively identified from 20 ug and 1 ug pervanadate treated HEK 293T cell lysates processed by the Phospho-SISPROT. To the best of our knowledge, this performance is the highest record reported to date by using standard LC-MS/MS setup. [dataset license: CC0 1.0 Universal (CC0 1.0)]

Keywords: phosphoproteomics

Contact

Principal Investigators:
(in alphabetical order) 		Ruijun Tian, SUSTech, China
Submitting User: wdchen
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